Service Interruption: CRA Data Centre Migration

The Canada Revenue Agency (CRA) is planning a major data migration initiative being led by Shared Services Canada (SSC). This migration will affect a number of CRA’s critical business applications and services, including those used by tax preparers.

Planned Outage Window

• Start: 8:00 p.m. Eastern Time (ET), Friday, August 29, 2025
• End: 6:00 a.m. ET, Tuesday, September 2, 2025

Note: There is a possibility the outage may extend to Wednesday, September 3, 2025.

During this time, the following services will be unavailable:

• EFILE for Individuals (T1)
• Corporation Internet Filing (T2)
• EFILE for Trusts (T3)
• Auto-fill my return (AFR)
• Client Data Enquiry
• Foreign reporting web services (e.g., T1134, T1135)
• Notice of assessment via Tax Software
• AgriStability/AgriInvest Corporation Forms submission service
• ReFILE service
• CRA email notifications
• T1 and T2 Special Elections and Returns web services